A 0100-M Long Solenoid Has a Radius of 0

Multiple Choice

A 0.100-m long solenoid has a radius of 0.050 m and 1.50 × 10⁴ turns. The current in the solenoid changes at a rate of 6.0 A/s. A conducting loop of radius 0.0200 m is placed at the center of the solenoid with its axis the same as that of the solenoid as shown.
-What is the magnetic flux through the small loop when the current through the solenoid is 2.50 A?

A) 2.95 × 10^-2 Wb
B) 7.28 × 10^-2 Wb
C) 2.95 × 10^-4 Wb
D) 4.38 × 10^-4 Wb
E) 5.92 × 10^-4 Wb